I have an adjustable boring tool for the mill and with that I got a set of 12 12mm boring bars with round shafts. These seem to be very good quality and it seems a shame to get so little use from them. I decided to make a boring tool holder for the lathe.
Used Ali as I have some in the BOX

Some Milling and a bit of Slitting and drilling and tapping later I had one of these.
The main hole was drilled and reamed with the reamer in the collet chuck in the lathe.

Gerhard